CVE-2021-42119 in TopEase Platform
Summary
by MITRE • 11/30/2021
Persistent Cross Site Scripting in Web Applications operating on Business-DNA Solutions GmbH’s TopEase® Platform Version
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Analysis
by VulDB Data Team • 12/04/2021
Persistent cross site scripting vulnerabilities in web applications represent a critical security weakness that allows attackers to inject malicious scripts into web pages viewed by other users. The vulnerability identified as CVE-2021-42119 affects Business-DNA Solutions GmbH's TopEase® platform, which is a business process management and workflow automation solution widely deployed in enterprise environments. This particular flaw enables attackers to execute malicious scripts in the context of the victim's browser session, potentially leading to complete account compromise and data exfiltration.
The technical implementation of this persistent cross site scripting vulnerability stems from inadequate input validation and output encoding mechanisms within the TopEase® platform's web interface. When user-supplied data is not properly sanitized before being rendered in web pages, attackers can inject malicious javascript code through various input vectors including form fields, URL parameters, or API endpoints. The persistence aspect indicates that the malicious code is stored server-side and executed whenever affected pages are loaded, making it particularly dangerous as it can affect multiple users over extended periods without requiring repeated exploitation attempts. This vulnerability aligns with CWE-79 which specifically addresses cross site scripting flaws in web applications.
The operational impact of CVE-2021-42119 extends beyond simple script execution to encompass comprehensive session hijacking, credential theft, and potential lateral movement within affected networks. Attackers can leverage this vulnerability to steal user authentication tokens, session cookies, and other sensitive information stored in the browser. In enterprise environments running TopEase® platform, this could result in unauthorized access to business-critical processes, workflow automation systems, and sensitive operational data. The vulnerability's persistence nature means that once exploited, malicious scripts can continue executing against all users until the underlying input validation is properly addressed. This makes the vulnerability particularly attractive to advanced persistent threat actors who seek long-term access to target environments.
Security professionals should implement immediate mitigations including comprehensive input validation, output encoding, and proper content security policy enforcement. The platform should be updated to the latest version containing patches for this vulnerability, while organizations should consider implementing web application firewalls and monitoring for suspicious script injection patterns. Regular security testing and code reviews should focus on input validation mechanisms, particularly in areas where user input is processed and displayed within web interfaces. This vulnerability demonstrates the critical importance of following secure coding practices and adhering to established security frameworks such as those recommended by the Open Web Application Security Project. Organizations should also conduct thorough security assessments of their business process management platforms to identify similar vulnerabilities that could compromise their operational integrity and data security.